your ID: 0304 
First Name: James 
Last Name: Reeves 
Affiliation: NASA/GSFC and Johns Hopkins University 

Title: High Velocity Outflows in AGN 
Authors: James Reeves 
Topic: 4 
Session: oral 

Abstract: 
The properties of AGN outflows are reviewed. High resolution 
observations of AGN with Chandra and XMM-Newton have shown 
that the majority of AGN possess warm absorbers, arising from outflows 
with typical (low) velocities of the order 1000 km/s which probably exist 
on the pc scale. Most recently there have been several claimed examples 
of high velocity outflows (0.1c) observed in the X-ray spectra of several 
AGN. The high velocity outflows are observed in the form of blue-shifted 
iron K-shell resonance absorption lines (above 7 keV) and also from high 
ionization absorption lines of O, Ne, Mg, Si in the soft X-ray spectrum. 
We show through photoionization modeling that the blue-shifted iron 
absorption line features are most likely to arise through a high velocity 
outflow, while other low velocity solutions are ruled out. The high velocity 
outflow is likely launched as a disk wind a few tens of gravitational radii from 
the black hole. Overall the outflows carry a significant proportion of the 
bolometric output of the AGN central engine in the form of kinetic energy 
and may also play an important role in the feedback mechanism between 
the massive black hole and the AGN host galaxy.